It was already growing dark when they extracted four feet of heavy metal shafting, splined at both ends, from the back axle; dripping with black oil they showed it to the Japanese corporal in charge of them as evidence of their industry.

Typically, a gear sensor will have only a speed or speed and direction output, but the new Cherry SD1012 series from ZF Electronics has two discrete quadrature outputs, allowing it to be used with a splined gear-tooth.